DE19712743C1 - Radio communications network planning method - Google Patents

Abstract

The method involves generating a virtual cell raster with a number of cells of a predetermined size and form. A subset of transmitter locations are determined from a list of already existing transmitter locations, which are located within a predetermined center area of the individual cells of the virtual cell raster. The determined subset of transmitter locations is maximised through repeated rotation and translation of the position of the cell raster with respect to the existing transmitter locations, and the maximum amount of transmitter locations contained in the determined subset are entered in a list.

Description

The invention relates to a method for radio network planning according to the preamble of claim 1. Different methods for planning cellular radio networks are from the state of the Technology, e.g. from Althoff, J .: room for change. In: net, 1991, No. 1-2, pages 22 to 25 or from DE 195 37 398 A1 known.

So that it does not cause interference in a communication network Runtime differences comes, it is necessary that Transmitter locations at a certain distance from each other erect. Defining the distances creates one Cell structure, with each transmitter a coverage area (Cell) is allocated.

The planning and review of the cell structure is currently taking place largely manually by a person responsible for planning Person instead. The planning and visual inspection is great time consuming and is only after calculation of Field strength distributions possible.

The object of the invention is therefore a method to propose that it allows the radio network planning in part automated.

This task is solved by the characteristic of the claim 1.

There will be a list of existing station locations used, these transmitter locations as possible Transmitter locations for the planned communication network in Come into consideration.  

The list contains at least information about the geographical Position and height of all existing transmitter locations contain. Every operator of a communication network owns such station location lists. The station locations are in a station location list.

In a modification of the invention it is provided that from the List of existing station locations by specific Criteria for a pre-selection according to those locations is taken for the planned communication network especially come into consideration.

The next step is a virtual one, previously in its Dimensions fixed cell grid generated that with the determined transmitter locations is compared. The location of the Cell grid is compared to the transmitter locations as long moved and twisted until a maximum number of Sender locations is determined, which is within a defined cell center. The radius of the Cell center and the cell spacing (cell size) can be about Call parameters can be defined beforehand.

The transmitter locations determined in this way are then in entered another list. Based on the determined Transmitter locations can use suitable tools respective field strength distribution can be determined.

It is also planned to generate a graphic file that a visual overview of the calculations, d. H. optimal cell grid and transmitter locations.

In addition to the effective and quick determination of possible Transmitter locations in the first planning phase can do that Method according to the invention in the further expansion of the network Control of the cell structure and for small cell planning within large cities and for location homogenization of an existing radio network.  

In addition, the method can also be used for calculations for Sub-areas, such as B. settlement areas will. Due to its geographical independence, the Procedures can be used universally and internationally.

The use of the method also ensures an optimal Use of existing transmitter locations guaranteed without therefor extensive investigations by the respective planner must be carried out.

The method according to the invention can advantageously be based on Computer program transferred so that for automatic Implementation of the method using only a computer system sufficient computing power is required. As Initial values of existing transmitter locations are required saved in a file.

In the following the invention is based on only one Execution path illustrating drawings explained in more detail. Here go from the drawings and their description further features and advantages essential to the invention Invention.

Fig. 1 shows an example of a virtual generated grid cells;

Fig. 2 shows a section of the virtual cell raster with superimposed existing transmitter locations;

Fig. 3 shows an example of an output chart of the optimum grid cells with the determined transmitter locations.

The first step of the method according to the invention is Examination of all existing transmitter locations containing station location file for the planned Communication network usable transmitter locations. This  Sender locations are based on various criteria such as e.g. B. structural resources, location and height of the location, etc. determined.

Table 1 shows an example of one Sender location file:

Table 1

In a further step, such as. B. is shown in Fig. 1, a virtual cell grid 1 is generated. The cell grid consists of a variety of z. B. hexagonal cells 2 , wherein the geographic position of each cell is defined based on the position of the cell center 3 . The size of the cells 2 , ie the distance between the cell centers 3 and one another, and the size of the cell center 3 can be set beforehand via call parameters.

As explained in FIG. 2, the cell size is determined via the mutual distance D of the cell centers and is specified by the user. The diameter M of the cell center 3 is defined as a percentage as a function of the mutual distance D of the cells 2 . Furthermore, the maximum positional deviation of the transmitter location from the actual cell center can be specified via a parameter.

The cell grid, ie the individual positions of cells 2 , are now compared with the determined transmitter locations.

By moving and rotating the cell grid with respect to the transmitter locations, a maximum of transmitter locations are found that are located within the individual cell centers. A suitable transmitter location must be in the defined cell center 3 in order to be considered as a possible cell location. In the example, the transmitter locations 4 are in the cell center 3 , whereas the transmitter locations 5 are outside the defined cell center 3 .

The maximum number of transmitter locations 4 determined in this way is stored in a file. This file now contains the data of the existing transmitter locations 4 , which can be used for the newly planned communication network.

On the basis of the determined transmitter locations, the field strength distribution is then examined in a known manner for each location. Further network planning is continued on the basis of the cell locations determined. At the same time, the result is shown graphically according to FIG. 3 in order to obtain a visual overview of the calculations. The optimal cell grid 1 is shown in the examined area and the determined transmitter locations 4 , which are located in the defined center region 3 of the cells 2 . The result is cell locations in which a suitable transmitter location is already located.

An example of possible cell sizes and cell center sizes should be given using a paging cell structure:
Standard cell structure:
Cell distance D = cell diameter = 15 km, defined diameter M of the cell center = 30% = 4.5 km.
Cell distance D = cell diameter = 4 km, defined diameter M of the cell center = 20% = 0.8 km.

Claims (5)

1. Procedure for planning cellular radio networks, characterized by the following steps:
Generation of a virtual cell grid with a large number of cells of predetermined size and shape,
Determining a subset of transmitter locations from a list of already existing transmitter locations that are within a predetermined center range of the individual cells of the virtual cell grid,
Maximizing the determined subset of transmitter locations by repeatedly rotating and shifting the position of the cell grid relative to the existing transmitter locations,
Enter the maximum number of transmitter locations contained in the determined subset in a list. 2. The method according to claim 1, characterized in that from a preselection from the list of existing transmitter locations suitable transmitter locations based on certain selection criteria is hit. 3. The method according to claim 1 or 2, characterized in that the size of the cells of the virtual cell grid by Entry of the mutual center distance is determined. 4. The method according to any one of the preceding claims, characterized characterized in that the size of the midpoint areas of the  Cells as a defined ratio to the distance of the Cell centers are specified. 5. The method according to any one of the preceding claims, characterized characterized that the cell grid and the transmitter locations the subset determined are graphically represented.